CVE-2025-8315: WP Easy Contact Plugin XSS Vulnerability

CVE-2025-8315 Overview

CVE-2025-8315 is a Stored Cross-Site Scripting (XSS) vulnerability in the WP Easy Contact plugin for WordPress. The flaw affects all plugin versions up to and including 4.0.1. It stems from insufficient input sanitization and output escaping on the noaccess_msg parameter within the plugin's form builder component. Authenticated attackers with Contributor-level access or above can inject arbitrary web scripts. The injected payload executes in the browser of any user who visits an affected page. The issue is tracked as CWE-79: Improper Neutralization of Input During Web Page Generation.

Critical Impact
Authenticated contributors can persist JavaScript in WordPress pages, enabling session theft, administrative action forgery, and drive-by redirection against site visitors and administrators.

Affected Products

WP Easy Contact plugin for WordPress, versions through 4.0.1
Vulnerable component: includes/emd-form-builder-lite/emd-form-frontend.php
WordPress sites permitting Contributor-level or higher user registration

Discovery Timeline

2025-08-05 - CVE-2025-8315 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8315

Vulnerability Analysis

The vulnerability resides in the plugin's form-frontend handler under includes/emd-form-builder-lite/emd-form-frontend.php. The noaccess_msg parameter accepts user-supplied content intended to display a message when a visitor lacks access to a form. The plugin fails to sanitize this input on save and does not escape it on output. As a result, HTML and JavaScript submitted through the parameter are stored in the database and rendered verbatim in the page context. When a visitor loads a page containing the injected message, the browser executes the attacker-controlled script under the site's origin.

Root Cause

The root cause is missing input validation and missing output encoding on a persisted plugin setting. WordPress provides sanitization helpers such as sanitize_text_field(), wp_kses(), and escaping functions like esc_html() and esc_attr(). The vulnerable code path stores the noaccess_msg value without applying an allowlist filter and emits it into HTML without escaping. This pattern is a textbook Stored XSS defect classified under CWE-79.

Attack Vector

An attacker must authenticate to the target WordPress instance with at least Contributor privileges. Contributors typically can create draft posts but not publish them, and this role is commonly available on multi-author blogs and community sites. The attacker submits a crafted noaccess_msg value containing a JavaScript payload through the plugin's form configuration interface. The payload persists in the database and is served to any user who renders a page invoking the affected form. Because scope is changed under the CVSS vector, the injected script runs against other authenticated users, including administrators, enabling session hijacking, CSRF exploitation, and privilege escalation via administrative account takeover.

No verified public proof-of-concept code is available. See the Wordfence Vulnerability Intelligence entry and the WordPress Changeset #3337661 for the vendor fix.

Detection Methods for CVE-2025-8315

Indicators of Compromise

Unexpected <script>, onerror=, or onload= substrings stored in WordPress wp_options or plugin-specific tables containing noaccess_msg values.
Outbound requests from visitor browsers to unfamiliar domains after loading pages that embed WP Easy Contact forms.
Newly created administrative users or role escalations following contributor account activity.
Session cookies or nonces observed in web server logs being transmitted to third-party hosts.

Detection Strategies

Query the WordPress database for noaccess_msg values containing HTML tags, JavaScript event handlers, or encoded script fragments.
Deploy Content Security Policy (CSP) reporting to capture inline script violations on pages rendered by the plugin.
Review plugin audit logs for changes to form configurations made by Contributor or Author accounts.

Monitoring Recommendations

Alert on WordPress user role changes and administrator account creations correlated with contributor session activity.
Monitor web application firewall logs for POST requests to plugin admin endpoints carrying script-like payloads.
Track outbound HTTP requests from the web server and from user browser sessions to previously unseen domains.

How to Mitigate CVE-2025-8315

Immediate Actions Required

Update the WP Easy Contact plugin to a version later than 4.0.1 as soon as the vendor publishes a fixed release. Consult the WordPress plugin developer page for the latest version.
Audit existing noaccess_msg values and remove any entries containing HTML or JavaScript.
Review Contributor and Author accounts, disable inactive users, and enforce strong authentication on all editorial roles.
Rotate administrator session cookies and reset passwords if injected script content is found.

Patch Information

The vendor addressed the vulnerability in WordPress Changeset #3337661, which modifies the affected includes/emd-form-builder-lite/emd-form-frontend.php file. Site owners should install the patched plugin release published on the WordPress plugin repository. The pre-patch vulnerable source is preserved at the WP Easy Contact 4.0.1 tag for reference.

Workarounds

Deactivate the WP Easy Contact plugin until the patched version is deployed if immediate updates are not possible.
Restrict registration and revoke Contributor or higher privileges from untrusted accounts.
Deploy a web application firewall rule blocking script tags and event-handler attributes in requests targeting plugin administrative endpoints.
Enforce a strict Content Security Policy that disallows inline scripts on pages rendering plugin content.

bash

# Example: enumerate stored noaccess_msg values for review
wp db query "SELECT option_id, option_name, option_value FROM wp_options WHERE option_value LIKE '%noaccess_msg%';"